c# string to hex

c# 汉字转16进制字节数组

        /// <summary>
        /// 从汉字转换到16进制
        /// </summary>
        /// <param name="s"></param>
        /// <param name="charset">编码,如"utf-8","gb2312"</param>
        /// <param name="fenge">是否每字符用逗号分隔</param>
        /// <returns></returns>
        public static string ToHex(string s, string charset, bool fenge)
        {
            if ((s.Length % 2) != 0)
            {
                s += " ";//空格
                //throw new ArgumentException("s is not valid chinese string!");
            }
            System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);
            byte[] bytes = chs.GetBytes(s);
            string str = "";
            for (int i = 0; i < bytes.Length; i++)
            {
                str += string.Format("{0:X}", bytes[i]);
                if (fenge && (i != bytes.Length - 1))
                {
                    str += string.Format("{0}", ",");
                }
            }
            return str.ToLower();
        }